Newshub can reveal that the Prime Minister has received multiple threats from anti-1080 extremists - including at least one threatening her life.

Violence and threats of violence by the fringe protesters have spiked, and Jacinda Ardern says she has serious concerns for the safety of Department of Conservation (DoC) workers.

A peaceful anti-1080 protest was held down the road from the Labour Party conference over the weekend, well away from Ms Ardern and her family.

She told Newshub she's received at least one death threat from anti-1080 extremists.

"I've had some incidents that I've been made aware of, but to be honest some of my greater concern is with those on the front line who receive these threats a bit more directly and a bit more personally."

One person posted on DoC's Facebook page warned that if their own daughter was poisoned by 1080, "I myself will find each of you DoC muppets and slaughter the skin off your faces and have you living inches before death."